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9.1 Square Roots. Pre-Algebra. Vocabulary. Square root : If , then m is the square root of n. Radical sign : represents the positive square root. represents the negative square root. Perfect square : Any number that has an integer square roots. Example: ,.

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9.1 Square Roots


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    1. 9.1 Square Roots Pre-Algebra

    2. Vocabulary • Square root: If , then m is the square root of n. • Radical sign: represents the positive square root. represents the negative square root. • Perfect square: Any number that has an integer square roots. • Example: ,

    3. Perfect Squares These are perfect squares. They have the same length and the same width. Area = length ∙ width

    4. Example 1: Finding Square Roots • What are the square roots of 81? • 92=81 and (-9)2=81. • The square roots of 81 are 9 and -9. • What are the square roots of 49?

    5. Example 2: Evaluating Square Roots Why? When computing the square root with the radical sign, you will have only one answer-the positive square root

    6. Example 3: Solving a Square Root Equation • To find the minimum speed a pole vaulter must run, you must use the following equation s = 8 • S is the pole vaulter’s speed in feet per second,and h is the height vaulted in feet. • If the pole vaulter vaults over a height of 25 feet, find the pole vaulter’s minimum speed. Write equation for speed of apole vaulter. Substitute 25 for h. Evaluate square root. Multiply.

    7. Example 5: Solving Equations Using Square Roots • Solve the equation. When solving for a variable, you will have two answers-the positive and negative square root. a.x2= 25 x2= 25 Write original equation. Use definition of square root. Evaluate square root.

    8. Example 5: Solving Equations Using Square Roots • Solve the equation. b.h2+ 5 = 54 h2+ 5 = 54 Write original equation. Undo the addition of 5. Simplify. Use definition of square root. Evaluate square root.

    9. You Try! • Solve the equation. 1. 2. x2= 81 x2= 1 x = ±9 x = ±1

    10. 12x2= 108 x = ±3 x2– 5 = – 1 x = ±2 3. 4.

    11. Think about it!! Can you find ? Why or Why not?